Counterfeit medicines can be very dangerous. Nitrates come as tablets, sublingual under the tongue tablets, sprays, patches, pastes, and ointments. Ask your doctor if you are not sure whether any of your medications contain nitrates. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Check the healthdirect’s medicines section for more information about tadalafil. Your doctor will probably tell you not to take tadalafil if you are taking street drugs containing nitrates.Coupon Code: If you have a coupon code, enter it in the box below and click ‘Go’. Enter your coupon code. Redeem Gift Certificate: To pay for this order using a gift certificate, enter the gift certificate code in the box below and . Print Free Discount Card. Note: This is a drug discount program, not an insurance plan. Valid at all major chains including Walgreens, CVS Pharmacy, Target, WalMart . Tadalafil Prices, Coupons and Patient Assistance Programs. Tadalafil is a member of the agents for pulmonary hypertension drug class and is commonly used for Benign Prostatic Hyperplasia, Erectile Dysfunction, and Pulmonary Arterial Hypertension.. Brand names for tadalafil include Cialis. The cost for tadalafil oral tablet 5 mg is around $27 for a supply .